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1.
If 
then 
then
2.
If 
and, 
then 
and, then
3.
The sum of 
is equal to
is equal to
4.
The sum of the products of the numbers 
, taken two at a time is
, taken two at a time is
5.
If 
then 
then
6.
The sum of the series 
is
is
7.
Which term of the sequence
(-8+18i), (-6+15i),(-4+12i),... is purely imaginary?
(-8+18i), (-6+15i),(-4+12i),... is purely imaginary?
8.
If then 
then
9.
If 
then
then
10.
If 
are in H.P., then 
is equal to
are in H.P., then is equal to